Sewing machine



FIG. 1 is a front, top, right perspective view of a sewing machine in accordance with our design;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is right side elevational view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a sewing machine, as shown and described. 